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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f0ff3df2b2b8c07f299336bd67a3bc84444e7b3f0951b1205699475837c2971' 
  AND token = 'CcM+SWH0fj20jM5qmRp9K8muRK7BLRt+NOl9kNZ7C4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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