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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531c15981d243a48767afac470aac612011ea7c9755fc8c376fef586e848c767' 
  AND token = 'hpGDSHXBTvuzUU/AwF2UxA/eWQH5QJg3EQ9F/zBXIEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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