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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57545c5cdcdc1bce123c307f7b8819fa3978ba98f10918a5126ec8f9f7e86d2c' 
  AND token = '26qx0D8xzSo21IxRVx5LBvc17l0QT/HPfchT6DWAgqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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