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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8725f73b7f495ff7463a9873e3824bf9090d08f11dab99447f972e31f73ab98e' 
  AND token = 'rDlKIRRpQTwjET66mgRmTvs5u9iTXhUw26dQdu6EhGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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