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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47eaf8b44c09d9aa095220edada2788d9fabec2b37e80180cd3147983ba3e263' 
  AND token = 'o9YN9w3jDAvw5w5z69NO4QANodPqp9O/ajsE9PGgTuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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