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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6f06a9a49cea181b37b52f5d2b1bb657e90e1a35015b06ba2ee3ca95d749c9' 
  AND token = 'tNRtZzvsDy6VOfV2JXyxH1LB/BBJS0t+YN8zRMw7TrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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