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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd410da5e2995fc93f043316b88d2d319e555bb40c828b2bfd5854fb00731d50d' 
  AND token = 'aLWEbcwgpDjI7Sw3uPN8e1HxxOEEoSCrfWkkNLjREMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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