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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd823a57fe94085d947c295e1725b48e35f8dd9485cd62b2823afd771ba0d7af3' 
  AND token = '1eVekJQ8+cTNNpnDeCqGn9RsVL8h6loQygH5TsK+BxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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