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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893acc4b011aa4b60c7e07c2239c19ce3e96d1d98922cbd368b7db9de0710f7b' 
  AND token = 'GhRfbUagyuGEnLHILRVHk9FpA/zQr2CMzsLlD9Dc+dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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