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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8f0bb2024e72a53cfe4e6a4dca3e180900aa6dd44a01e4c01407e953c7f4e29' 
  AND token = 'UmnaEk5MrMZoUXwfzvmZ34DjilbVpd6yi4hEdmFc+a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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