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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac283295a266f79dc6d9dae1773b9f576ab80618286e18e8c19244972ac2ce28' 
  AND token = 'l6zXUPBXfbi5wiyJLRj2r6/ObCP0ytrI+xoRX4wzLyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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