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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c94e414d1a140919d56fcb70b8794a5f941bd00f5a039cd7d1d9b19511741025' 
  AND token = 'CqDEYLl9fYo1td9hvecfRQ1S9JhTY+gc7pP4zCe/+ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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