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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ba15c2693d5267dfb9288d6c684b103e7fb564eead8d0bd1270e0b7ed5edcb' 
  AND token = 'TrZqK0Unl/2VdebB6R4DeGsI5u813FJjKH0cZTkOXlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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