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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d67355df1cf20d6ee582e157205cec80cb57f73d0a9c151fbe7ccc3240dcba' 
  AND token = 'qdPy6OAXj898C+1Mkn1FAi1if6je6f1mETqJhBQHzz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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