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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ad21a9b4ce4f84bcda6941074a95305ca2940af29bd42a15b22df526629007' 
  AND token = 'iQuvjUYCl7T/tEbbaavfZq0vNp3bGyk0rjI11WgU+f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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