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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '730003b8b4c33f9b0f0e15e13b4b04b28d39407a5ce5f1bf29ed365cc0ab8899' 
  AND token = 'mX1CIXr01PzwhkJuOr3ZXz9f9YBsjLt5gzHNMf2P4YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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