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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd815ced774acdf1026d6e5f99468abd08bd63952e5b626ad2ceeffd80790d8ab' 
  AND token = 'Bd35yP0/Y2DJgluRsDExhgHhY8L73LIVPUOpfxE4shc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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