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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6c3287b30a2508efed94dc0fd9b2d141c48d8d323d4913e795850b2bc8b8a3' 
  AND token = 'o5L1Iv+qdU48fTxu26BQueOn8Ww3k95g43Qag46j1GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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