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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81d33337309ea53bf1149208c290d6b75b0a167a497c9d1605f1d4a0f4680b7e' 
  AND token = 'KwAzUw5aSMTxtRMJHocWO0qFDdp/K2eRPAV36mpdxDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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