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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7bee9c1c451e9d6a5c8f8c6e45aecda77c3d8cfbbbcc519d1ad3fc82f174ec' 
  AND token = 'Er2B3HYFnQq6CcgPTibBIfhpoW6x+z6vpxoqAKFkgBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}