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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1764b5e75d177c78d78ddd20b3464cbf49b4c2e6425e82dceb2140c5f1e56a60' 
  AND token = 'TOe3FiozuRBRUyKqNdcQpq7t+JRm8S0DTZ2uD31pVSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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