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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '334ecdc94371a351d545f1b654eee1c684018371779c290ce5a5c85452d3a033' 
  AND token = 'vNP/b3F+qN+PlHuxHuZWpvHVYNddnxPo/+/c2eN5IMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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