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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41fb076e94bf10a6e61c51db9d89abd699617b895db19aef528f3494a7b4234f' 
  AND token = 'HNCaCDzyPBGoumS169W5PlasRMETrNfeZ+pAByLe+dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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