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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e65d3aa67285d05721686fdb456591609ff42f115d4a4013216ba2c1d33a69' 
  AND token = '5P5v+p5fPj5OMAWmiU+x2i1L+qpfa6MpBiugX3MgwGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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