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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56744e40fd411e8b12fc7345103227ffd1919201cc3af816eefbdff085f7f276' 
  AND token = 'jnVIWGVhsVooNIyUbPas5NDtRzu0gmm0n5OI7JcoHqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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