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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1631e479c946d6e08756dfd5ac99a55a1589045048af8ecaeabdfc7f74260344' 
  AND token = 'jockIIUEdcf9B5ANktqz1jNd2r/68CcEVFSVrg8mHJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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