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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe8ce61337387edc66865377f421dc8755cc7418d68c6969996597249e89512' 
  AND token = 'pL31Y+m0vSWgKoghSo9fULqaX0y7ZwNpsJgjrloSLLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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