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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beeb51e529d3cbe2c32b3dae1a4084cc47c1ea9e14f2a16a504fda4ddbb8715d' 
  AND token = 'ulctJvkVL8LAdbD21KGRHZ4p9egi4LXJPnKNk4EX148=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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