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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d32415f0fcf266ef2b5a8c23e16fc97450895d50f5b69b51114baf0ef2a691b' 
  AND token = 'H/QDX2KgoOaK4qCF4ciokh/7j584xf0g4i4F6ShNI+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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