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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda0fa5ffa695c6f6203e480a05aad6a4fa58a5438429dbf7c45c69fed5a27fe' 
  AND token = 'SIFwKeQm9onV64uu5CKxZFqKAdVDZ9UaEIWv28FS+bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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