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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e6d350a6151a2b1199936de840d53406a8605652dd2a278a56355aff38730a' 
  AND token = 'LQNO1hAgsYQeWeQ4aTF7neNl3kTUbLuNBRL+Hp133Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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