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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adfc17f4004dda94eccc6ca15bee20f571aeafc3b8a5acd8b4553b8c34d24428' 
  AND token = 'WaFrzG8KSWHeOGPksmVV7LoNwniVItGl6O/ZI76PGSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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