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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '016be767fd19d4fd05327adfb04b5e83c7ebe4e77b0fc913f6a0fc8b05bd4382' 
  AND token = 'AYDYY4hGEui7t3l9sOKWPZ4hJpzRhkRYSd7YtWREhCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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