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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd09877e1dc8a646d9c8c36cc9953e433b84eeec0ed0ad43e4e6bcebd74c0050' 
  AND token = 'J518jZJzJiBaZL19rxNbZQ5D2veTOZeDnQ8kgAWsl0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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