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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63fc1d0416ed3d444bcac4c14c95bec4fb41ed1fbf11e16505276a4a39920d6e' 
  AND token = 'kobn6WcFi/0WOv1oZOCxDEYVpmp37N6tYXsyNRjKNX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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