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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a327e0b5d5742de759bcf44133b054f850c26649222f3d7d222eb334886b28c0' 
  AND token = '6pXg4HU2Gz8wB2BArQvkMkz95btwgXMxsR7odJG/4nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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