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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367b4003dde16df76acf7daeeb67bb052c29e348d175ab90529ac6d31bda8840' 
  AND token = 'H+PlcZoHLFSHyr5drZPu3uo9NWrPcNkggHecMCjetFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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