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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7b48cc1d5838547bca9238f67210d64d6b511d3acea5fa5aa416bf6f1720fa' 
  AND token = 'h+F80Xmc67eIADnK7SfJDHot1APWgButFrOfQZVuzb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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