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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d13890c988ada906a9ca04b837161c11c28b464ca408eb3d97ca2c8c6edfe7f' 
  AND token = 'yh9cXoStYORiReRKv4sL1sh4IcX/K9hsu4mQbD/Djbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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