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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a619e1c3d23879f1f8a9ccd0d8da7dcf97d9322c426f2c6bf4f780f0b553a2d2' 
  AND token = 'FPhBc+ysQY+tEYuTtqgjIprOxcVOBzh/AtW256b62TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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