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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8bbda2a491378f3f8c0804809006ccd2e27c60c5b622e40bedc9f92670aec3d' 
  AND token = '4oOnoOpn5wm/zjmMTb2fAJ76TDY9Um7l/gM9OCS0niQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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