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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c6154a347a4274ef26205714627b9d926f9e48eba6e53d94ddc17992dfb7fff' 
  AND token = 'WPM6SOuT/eUlCSvbiuXJgahXz9q10p1m915YetAMFDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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