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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db9f2e5c52d00cbe740c83c6370735305f323d5db0b0edfd2fb95815bb09531e' 
  AND token = 'WEFMoSO8MM5nI6+M5Du4gpbWRYtQMw8ACPGulAecizc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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