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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08b01178a0277b8674e0f145e29d1cb52089e6679feccbe808b26ca4fd7fcd2' 
  AND token = 'BzhpYdj0AL4X3KnXTrQrEdPeA/INvt4xjEBSv8xFTk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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